Renesas 70V24S15PF8

Overview

70V24S15PF8 from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 15 ns max read cycle time (commercial grade), 3.3 V single supply, and 84-pin PLCC package. It supports full on-chip semaphore arbitration and BUSY flag signaling for inter-processor communication in real-time embedded control systems.

For engineers reviewing the 70V24S15PF8 datasheet, 70V24S15PF8 pinout, 70V24S15PF8 application, or 70V24S15PF8 equivalent, key selection criteria include dual-port timing compatibility, industrial temperature support (-40°C to +85°C), low-power standby (660 µW typ.), and master/slave cascading capability for wider data bus expansion.

Technical Context

The 70V24S15PF8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - enabling simultaneous read/write access to the same memory location without external arbitration logic. Its on-chip arbitration logic resolves port contention via BUSY flag assertion and supports eight hardware semaphores addressed by A0–A2.

It uses CMOS high-performance technology with TTL-compatible inputs and push-pull outputs (non-tri-stated BUSY/INT), operates at 3.3 V ±0.3 V, and features automatic power-down via CE-controlled standby modes - including full CMOS-level standby (ISB3 = 0.2 mA typ.) and one-port active standby (ISB4 = 65 mA typ. at 15 ns).

Key Specifications

Pinout & Package

70V24S15PF8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC, package code PLG84), with dimensions approximately 1.15 in × 1.15 in × 0.17 in. All VDD pins require local 3.3 V decoupling; all VSS pins must be grounded.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C024AV-15AXC and AS7C34096B-15TIN, the 70V24S15PF8 uniquely integrates BUSY flag signaling and eight hardware semaphores in an 84-pin PLCC - reducing BOM count and PCB area for industrial control and automotive applications requiring deterministic inter-processor coordination.

Availability

70V24S15PF8 is available at Aetrix Electronics and suitable for motor control systems, industrial PLCs, automotive ADAS subsystems, and medical imaging equipment requiring stable component supply across extended product lifecycles.

Supply support for 70V24S15PF8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs for communications, computing, and industrial markets.

The IDT70V24 family delivers high-speed dual-port SRAMs optimized for real-time embedded systems requiring deterministic inter-processor communication, hardware-accelerated semaphore management, and industrial-grade reliability.

FAQ

What is the maximum operating frequency supported by the 70V24S15PF8?

The 70V24S15PF8 supports a 15 ns read cycle time (tRC), enabling reliable operation at up to 66.7 MHz in commercial temperature range. Its asynchronous dual-port architecture does not rely on a system clock; timing is governed by control signal setup/hold relationships - allowing variable-rate access from independent processors without synchronization overhead. The 70V24S15PF8 achieves this performance at 3.3 V ±0.3 V with full industrial temperature qualification.

Does the 70V24S15PF8 support hardware semaphore functionality, and how is it implemented?

Yes, the 70V24S15PF8 includes full on-chip hardware semaphore logic supporting eight independent flags. These are accessed via address lines A0–A2 when SEM is asserted low and CE/UB/LB are high - placing the device in semaphore mode. Each flag can be atomically written (via I/O0) and read (via all I/O lines), enabling lock-free inter-processor coordination without CPU intervention. This capability is confirmed in Truth Table II and timing diagrams on pages 5 and 14 of the official datasheet.

Can the 70V24S15PF8 be used in master/slave configurations, and what pins enable this?

Yes, the 70V24S15PF8 supports master/slave cascading via the M/S pin: when driven high, BUSY functions as an output flag indicating port contention; when driven low, BUSY becomes an input for slave synchronization. This allows multiple devices to be chained for 32-bit or wider memory expansion without external arbitration logic. The feature is explicitly documented in the Features section (page 1) and Pin Names table (page 5) of the datasheet.

What is the standby current consumption of the 70V24S15PF8, and under which conditions is it measured?

The 70V24S15PF8 achieves 660 µW typical standby power (ISB1) when both ports are disabled (CEL/CER = VIH, SEM = VIH) and operating at fMAX. In full CMOS standby (ISB3), current drops to 0.2 mA typ. when all inputs are held at valid CMOS levels (VIN > VDD − 0.2 V or < 0.2 V) and f = 0. These values are specified in Table 09b (page 8) for the 70V24 variant and reflect its low-power design for battery-backed or energy-constrained embedded systems.

Is the 70V24S15PF8 pin-compatible with other members of the IDT70V24/25 family, and what are the key package differences?

No - the 70V24S15PF8 uses an 84-pin PLCC (PLG84) package, while IDT70V25/24S/L variants in TQFP use 100-pin PNG100. Although electrical functionality overlaps (e.g., identical pin names and roles), physical pinout differs: PLCC has perimeter leads with corner index mark, while TQFP has gull-wing leads. A12 is NC in both, but PLCC pin mapping (e.g., I/O8L at pin 3, BUSYL at pin 33) does not align with TQFP positions. Board redesign is required for substitution.